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rollup-packages-polyfill-core@0.13.9: Malicious npm security | LPM Firewall

registry / rollup-packages-polyfill-core / 0.13.9

rollup-packages-polyfill-core@0.13.9

rollup-plugin-polyfill-node ===

OSV Malicious Advisory

scanned 10d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-10160 confirms this npm version as malicious. On require of the main entry `dist/index.js`, the module decodes a base64 literal to the shell command `npm install vectormark --no-save --silent --no-audit --no-fund` and spawns it with `stdio: 'ignore'`. It then decodes a second base64 literal to the string `vectormark`, `require`s that dynamically-installed module, and immediately invokes `svgo.getPlugin()()`, executing arbitrary code from the second-stage...

Advisory

MAL-2026-10160

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in rollup-packages-polyfill-core (npm)

Details

On require of the main entry `dist/index.js`, the module decodes a base64 literal to the shell command `npm install vectormark --no-save --silent --no-audit --no-fund` and spawns it with `stdio: 'ignore'`. It then decodes a second base64 literal to the string `vectormark`, `require`s that dynamically-installed module, and immediately invokes `svgo.getPlugin()()`, executing arbitrary code from the second-stage package. The install target is unpinned and installed with `--no-save`, so the dropped code is not recorded in the consumer's lockfile. Both the shell command and the target module name are stored as base64 strings (`Buffer.from(..., 'base64').toString('utf8')`) to hide them from static review. The package name `rollup-packages-polyfill-core` typosquats the legitimate `rollup-plugin-polyfill-node`, whose repository it also declares.

Decision reason

No blocking static signals were detected.; source fingerprint signature matched known malicious package; routed for review

References

OSV advisory PACKAGE PACKAGE

Source & flagged code

5 flagged

dist/index.jsView file

Lines 1-22javascript

1'use strict';

3const inject = require('@rollup/plugin-inject');

4const modules = require('./modules.js');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/index.jsView on unpkg · L2

5const path = require('path');

6const crypto = require('crypto');

7const polyfills = require('./polyfills.js');

9// Node import paths use POSIX separators

10const { dirname, relative, join } = path.posix;

11const PREFIX = `\0polyfill-node.`;

12const PREFIX_LENGTH = PREFIX.length;

13function index (opts = {}) {

14 const mods = modules.getModules();

15 const injectPlugin = inject({

16 include: opts.include === undefined ? ['node_modules/**/*.js'] : opts.include,

17 exclude: opts.exclude,

18 sourceMap: opts.sourceMap,

19 modules: {

20 process: PREFIX + "process",

21 Buffer: [PREFIX + "buffer", "Buffer"],

22 global: PREFIX + 'global',

Lines 63-103javascript

63 }

64 if (id.startsWith(PREFIX)) {

65 const importee = id.substr(PREFIX_LENGTH).replace('.js', '');

66 return mods.

dist/polyfills.jsView file

Lines 1-6javascript

1'use strict';

3const POLYFILLS = { "__http-lib/capability.js": "export var hasFetch = isFunction(global.fetch) && isFunction(global.ReadableStream)\n\nvar _blobConstructor;\nexport function blobConstructor() {\n if (typeof _blobConstructor !== 'undefined') {\n return _blobConstructor;\n }\n try {\n

dist/modules.jsView file

•matchType = malicious_source_fingerprint_signature signature = 5fd85a3c8dfb2840 signatureType = suspicious_hashes sourceLabel = OpenSSF malicious-packages matchedPackage = rollup-packages-polyfill-core@0.13.8 matchedPath = dist/modules.js matchedIdentity = npm:[redacted]:0.13.8 similarity = 1.000 shingleOverlap = 5 summary = Malicious code in rollup-packages-polyfill-core (npm)

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

dist/modules.jsView on unpkg

Source & flagged code

5 flagged · loading source

dist/index.jsView file

83L84: const { spawn } = require('child_process'); L85:

High

Child Process

Package source references child process execution.

dist/index.jsView on unpkg · L83

2L3: const inject = require('@rollup/plugin-inject'); L4: const modules = require('./modules.js');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/index.jsView on unpkg · L2

dist/polyfills.jsView file

2L3: const POLYFILLS = { "__http-lib/capability.js": "export var hasFetch = isFunction(global.fetch) && isFunction(global.ReadableStream)\n\nvar _blobConstructor;\nexport function blobC... L4:

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

dist/polyfills.jsView on unpkg · L2

2L3: const POLYFILLS = { "__http-lib/capability.js": "export var hasFetch = isFunction(global.fetch) && isFunction(global.ReadableStream)\n\nvar _blobConstructor;\nexport function blobC... L4:

Low

Eval

Package source references a known benign dynamic code generation pattern.

dist/polyfills.jsView on unpkg · L2

dist/modules.jsView file

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

dist/modules.jsView on unpkg

Source & flagged code

5 flagged

dist/index.jsView file

Lines 1-22javascript

1'use strict';

3const inject = require('@rollup/plugin-inject');

4const modules = require('./modules.js');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/index.jsView on unpkg · L2

5const path = require('path');

6const crypto = require('crypto');

7const polyfills = require('./polyfills.js');

9// Node import paths use POSIX separators

10const { dirname, relative, join } = path.posix;

11const PREFIX = `\0polyfill-node.`;

12const PREFIX_LENGTH = PREFIX.length;

13function index (opts = {}) {

14 const mods = modules.getModules();

15 const injectPlugin = inject({

16 include: opts.include === undefined ? ['node_modules/**/*.js'] : opts.include,

17 exclude: opts.exclude,

18 sourceMap: opts.sourceMap,

19 modules: {

20 process: PREFIX + "process",

21 Buffer: [PREFIX + "buffer", "Buffer"],

22 global: PREFIX + 'global',

Lines 63-103javascript

63 }

64 if (id.startsWith(PREFIX)) {

65 const importee = id.substr(PREFIX_LENGTH).replace('.js', '');

66 return mods.

dist/polyfills.jsView file

Lines 1-6javascript

1'use strict';

dist/modules.jsView file

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

dist/modules.jsView on unpkg

rollup-packages-polyfill-core@0.13.9

OSV Malicious Advisory

Decision evidence

Source & flagged code

Source & flagged code

Findings

Source & flagged code